/*
 * Copyright (c) 2006 Israfil Consulting Services Corporation
 * Copyright (c) 2006 Christian Edward Gruber
 * All Rights Reserved
 * 
 * This software is licensed under the Berkeley Standard Distribution license,
 * (BSD license), as defined below:
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this 
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution.
 * 3. Neither the name of Israfil Consulting Services nor the names of its contributors 
 *    may be used to endorse or promote products derived from this software without 
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, 
 * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 
 * OF SUCH DAMAGE.
 * 
 * $Id: ArraySet.java 19 2006-01-30 21:52:52Z cgruber $
 */
package net.israfil.foundation.collections;

import java.util.AbstractCollection;
import java.util.Iterator;

/**
 * A simple unmodifyable implementation of Collection that takes a single (possibly
 * null) constructor parameter.  The collection then "contains" this single object.
 * 
 * @author <a href="mailto:cgruber@israfil.net">Christian Edward Gruber </a>
 */
//@Copyright(years={"2006"},owner="Israfil Consulting Services Corporation",license="BSD")

public class SoloCollection extends AbstractCollection {
	protected final Object o;
	public SoloCollection(Object o) {
		super();
		this.o = o;
	}

	public Iterator iterator() {
		return new Iterator() {
			boolean beforeFirst = true;
			public boolean hasNext() { return beforeFirst; }
			public Object next() { beforeFirst = false; return o; }
			public void remove() { 
				throw new UnsupportedOperationException("Cannot remove from a singleton colelction");
			}
		};
	}

	public int size() { return 1; }
}
